Gunite Quality

 
That's not a drill; that's a jackhammer and they are making a big mess.

Why is the thickness being questioned?

If they want to verify the thickness, they should just core drill some holes.

There is a lot more to the story than you are providing.
 
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"Gunite was shot a year ago.

Plumbing was started.

I have photos of some pipes on interior of pool.

Builder didn’t connect pipes to pump pad until a week ago.

The pool shell popped out of ground Fall of 2022.

Pool builder said all was okay because the shell settled back into hole.

Pool builder put in a French drain around the perimeter during Spring 2023.

We still had water in both in pool and around it.

Tile and coping and deck installed early Summer 2023.

Plaster scheduled for a Thursday a couple of weeks ago.

The rain water was pumped out of shell and the pool was power washed for plaster.

The next day there was about 10 inches of water in the deep end.

Plaster crew pumped it out, shot plaster.

The pool took a couple of days to fill, but I noticed we were losing water.

Meanwhile, a crew was hand digging a hole next to the pool to ready for a sump pump system.

They could get far down because the hole was slowly filling with water.

About 6 days after the plaster completion, I noticed a structural crack running the entire perimeter of the pool floor.

We know that it’s leaking water.

What caused the structural failure?"